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Ubuntu Security Notice USN-7503-1
May 08, 2025

python-h11 vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.10
- Ubuntu 24.04 LTS

Summary:

python-h11 could be made to expose sensitive information over the
network.

Software Description:
- python-h11: Pure-Python, bring-your-own-I/O implementation of HTTP/1.1

Details:

Jeppe Bonde Weikop discovered that h11 incorrectly handled crafted HTTP
requests. A remote attacker could possibly use this issue to smuggle
malicious HTTP requests, which could potentially lead to security
control bypass and information leakage.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.10
  python3-h11                     0.14.0-1ubuntu0.24.10.1

Ubuntu 24.04 LTS
  python3-h11                     0.14.0-1ubuntu0.24.04.1

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-7503-1
  CVE-2025-43859

Package Information:
  https://launchpad.net/ubuntu/+source/python-h11/0.14.0-1ubuntu0.24.10.1
  https://launchpad.net/ubuntu/+source/python-h11/0.14.0-1ubuntu0.24.04.1